The by-election was called after mayor János Süli was appointed minister without portfolio overseeing Paks II by President János Áder on April 26. As minister he oversees the planning, construction and operation of two new nuclear reactors at Hungary’s Paks nuclear plant. Süli resigned as Paks mayor on May 31, since when Szabó has been executive leader. In 2014 Süli won as the candidate of the local People’s Party (Néppárt) that also won in all Paks districts.